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{{PatentInfo |Inventor=Ivan D. Tefft |Assignee=The Parker Pen Company |Country=US |ApplicationNum=607380 |ApplicationDate=1945-07-27 |PatentNum=2452504 |PatentDate=1948-10-26 |PriorityDate=1945-07-27 |Titolo=Writing instrument |Marca=Parker |Descrizion...
{{PatentInfo
|Inventor=Ivan D. Tefft
|Assignee=The Parker Pen Company
|Country=US
|ApplicationNum=607380
|ApplicationDate=1945-07-27
|PatentNum=2452504
|PatentDate=1948-10-26
|PriorityDate=1945-07-27
|Titolo=Writing instrument
|Marca=Parker
|Descrizione=Penna a sfera
}}
==Informazioni==
Brevetto per una penna a sfera. Riferimenti a {{MentionPatent|US|538492}}, {{MentionPatent|US|554189}}, {{MentionPatent|US|600299}}, {{MentionPatent|US|748383}}, {{MentionPatent|US|987169}}, {{MentionPatent|US|1179086}}, {{MentionPatent|US|1373146}}, {{MentionPatent|US|1808377}}, {{MentionPatent|US|1935000}}, {{MentionPatent|US|2106046}}, {{MentionPatent|US|2107424}}, {{MentionPatent|US|2390636}} e {{MentionPatent|US|2416896}}, ed inoltre {{MentionPatent|DE|491057}}.
|Inventor=Ivan D. Tefft
|Assignee=The Parker Pen Company
|Country=US
|ApplicationNum=607380
|ApplicationDate=1945-07-27
|PatentNum=2452504
|PatentDate=1948-10-26
|PriorityDate=1945-07-27
|Titolo=Writing instrument
|Marca=Parker
|Descrizione=Penna a sfera
}}
==Informazioni==
Brevetto per una penna a sfera. Riferimenti a {{MentionPatent|US|538492}}, {{MentionPatent|US|554189}}, {{MentionPatent|US|600299}}, {{MentionPatent|US|748383}}, {{MentionPatent|US|987169}}, {{MentionPatent|US|1179086}}, {{MentionPatent|US|1373146}}, {{MentionPatent|US|1808377}}, {{MentionPatent|US|1935000}}, {{MentionPatent|US|2106046}}, {{MentionPatent|US|2107424}}, {{MentionPatent|US|2390636}} e {{MentionPatent|US|2416896}}, ed inoltre {{MentionPatent|DE|491057}}.